Abstract
As the working face advances, the overlying aquiclude is subjected to periodic dynamic loads, causing pore water pressure distortion, which provides important forewarning for a water inrush disaster in shallow coal seams. In order to analyze the pore water pressure in an aquiclude and determine the spatial-temporal characteristics of the water inrush, the aquiclude is simplified into a saturated, porous, liquid-solid medium and a viscoelastic dynamic model is created to obtain the analytical solution of the pressure distribution. FLAC3D is used to develop a fluid-solid coupling model and to analyze the characteristics of the pressure change and overburden under different mining intensities. This study on pore water pressure in an aquiclude and the determination of the spatial-temporal characteristics of the water inrush provides a foundation for developing early-warning systems for roof water inrush.
Highlights
In recent years, the coal exploitation intensity has increased in the western coal mining areas in China and exploitations under thin bedrock and in water-rich areas have caused frequent occurrences of coal mining water inrush [1, 2]
Based on the similarity between the influences of mining disturbances and the transfer of the wave frequency of an earthquake to a periodic dynamic load, we assume that the spatial-temporal characteristics of roof water inrush can be observed by the changes in the pore water pressure in an aquiclude as a result of mining disturbances; in addition, we propose that the “hydraulic pressure-stress” spatial-temporal system can be determined for the “aquiclude coal seam” structure. is study is focused on the determination of the spatial-temporal characteristics of the water inrush using qualitative and quantitative analyses to prevent water inrush disasters from the roof
Spatial-Temporal Characteristics of the Pore Water Pressure with Full ickness Exploitation. e analysis of the spatial-temporal characteristics of the pore water pressure and roof water inrush is conducted by observing the changes in the pore water pressure of the aquiclude for different distances to the working face
Summary
The coal exploitation intensity has increased in the western coal mining areas in China and exploitations under thin bedrock and in water-rich areas have caused frequent occurrences of coal mining water inrush [1, 2]. In the coal mining areas in the northern areas of Shaanxi province, the coal stockpiles are stable and abundant and suitable for exploitation with high-intensity mechanized mining equipment. The coal seams in the northern area of Shaanxi province are shallow and as a result, the unique and critical aquiclude becomes unstable [3] because of the strong mining disturbance and water seepage. Wu et al [14] designed a three-dimensional visual model of water inrush from a coal seam roof and implemented a dynamic simulation of the bedrock cracking and groundwater flow field using visualization in the foundation of the “ ree Maps” method. Fan et al [15] identified the critical factors influencing water and sand inrush in the Yushenfu coal mine, and these factors included the sand thickness, aquiclude water richness, the thickness of the
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